Sodium borohydride → (2R,5R)-5-[(1S,2S)-2-Amino-3-(3-chloro-5-fluorophenyl)-1-hydroxypropyl]-2-(2,2-dimethylpropoxy)-morpholine-4-carboxylic acid tert-butyl ester

Dissolve (2R,5R)-5-[(1R,2S)-3-(3-chloro-5-fluorophenyl)-1-hydroxy-2-nitropropyl]-2-(2,2-dimethylpropoxy)-morpholine-4-carboxylic acid tert-butyl ester (0.455 g, 0.901 mmol) in methanol (8 mL) and stir at room temperature in an oil bath. Add anhydrous nickel (II) chloride (0.175 g, 1.35 mmol) followed by sodium borohydride (0.170 mg, 4.50 mmol) in 3 portions over 5 minutes and stir for 15 minutes. Add water (2 mL), 0.1 N sodium hydroxide (2 mL) and extract with ethyl acetate (2×30 mL). Combine organic extracts, wash with saturated aqueous sodium chloride (30 mL), dry (sodium sulfate), filter through a pad of Celite® and concentrate to give the desired compound as a colorless oil (0.428 g).

1. stirringstir for 15 minutes
2. extractionAdd water (2 mL), 0.1 N sodium hydroxide (2 mL) and extract with ethyl acetate (2×30 mL)
3. washCombine organic extracts, wash with saturated aqueous sodium chloride (30 mL)
4. dry with materialdry (sodium sulfate)
5. filtrationfilter through a pad of Celite®
6. concentrationconcentrate

ORD 기록

ord-8f93c0006e9041f8b7a31052bf892019

출처 데이터셋

uspto-grants-2010_06

DOI

10.6084/m9.figshare.5104873.v1

특허 번호

US07745438B2